Radial-arm drilling-machine



J. JEWSBURY.

RADIAL ARM DRILLING MACHINE.

APPLICATION men AUG.28, ms.

1,354,&8& menm 001;, 5, 192g,

3 SHEETS-SHEET I.

KU/Zy I J. JEWSBURY.

RADIAL ARM DRIL'LINIE MACHINE.

APPLICATION FILED AUG.28, 191a.

Patented Oct. 5, 1920.

3 SHEETS-SHEET J. JEWSBURY.

RADIAL ARM DRILLING- MACHINE.

APPLICATION FILED AUG. 28', 1918.

1,354,4 8, Patented 001s. 5,1920.

3 SHEETS-SHEET 3.

Fig-.7

ld ews 7510719 JOSEPH JEW SBURY, OF BIRMINGHAM,

ENGLAND, ASSIGNOR TO JAMES AROHDALE &

COMPANY LIMITED, OF BIRMINGHAM, ENGLAND.

RADIAL-ARM: DRILLING-IIIACHINE.

Specification of Letters Patent.

Pater ted Oct. 5, 1920.

Application filed August 28. 1918. Serial No. 251,842.

7 '0 all whom it may concern:

Be it known that I, JOSEPH JEWSBURY, draftsman, of 34 lVilton road, Handsworth, in the city of Birmingham, England, sub ject of the King of Great Britain and Ireland, have invented certain new and useful Improvements Relating to RadiaLArm DrillingMachines, of which the following is a specification.

This invention relates to radial arm drilling machines of the type in which the saddle carrying the drill is movable along an arm which can be moved on the pillar of the machine. The object of the invention is to provide improved means for locking the saddle to the arm and the latter to the pillar simultaneously by the actuation of a lever on the saddle.

The invention comprises the combination of a pair of sliding members which are relatively movable by a floating member to which a hand lever is secured, and means preferably of the rack and pinion type for transmitting motion from each sliding member to the looking devices.

Referring to the accompanying sheets of explanatory drawings Figure 1 is a side elevation and Fig. 2 a cross section of lock operating mechanism constructed in accordance with this invention.

Fig. 3 is a diagrammatic plan illustrating the action of the mechanism.

Figs. 4C, 5, 6 are respectively side elevation,

cross section and plan of an alternative construction of one look operating mechanism.

Fig. 7 is a front elevation of a radial arm drilling machine provided for this invention.

In carrying the invention into effect as shown in Figs. 1 to 3, a cylindrical member a formed with a rack is mounted partly within an outer member 6 which is provided with lugs 0 carrying a pinion or sector (5 engaging the rack. This pinion or sector being mounted on a part which is free to move is termed a floating pinion. Both members are free to move and relative motion is obtained by a hand lever e which is secured to and actuates the pinion or seetor (Z. The said rack on the inner member also engages a pinion f on a spindle g by which a clamping screw can be actuated for locking the saddle 71, on the arm 2'.

The arrangement above described is carthe shaft 70 is shown with its axis at right ried on a bracket 7' attached to the saddle and arranged to slide along a shaft In car ried at the rear of the arm. The shaft is is employed to operate, by a rocking or partial rotary movement, any convenient locking device between the arm and pillar. As shown in Fig. '7 the shaft 70 engages through bevel pinions m a shaft a. This shaft is formed with a cam 0 engaging a clamping bolt p. T he bolt passes through lugs g on a slotted sleeve 1 carrying the arm 5 and sur rounding the pillar .9. Operation of the cam causes the bolt to tighten the slotted portion of the sleeve on the pillar. This is a known device and forms no part of the present invention. Mounted on the bracket j and also movable along the shaft 76 is a sector Z which can rock the shaft. This sector engages another rack on the outer sliding member 6 above mentioned.

By the actuation of the hand lever relative motion is produced between the inner and outer sliding members. The motion of the inner member serves to lock the saddle to the arm while the motion of the outer member serves to lock the arm to the pillar. As the said members can-move either sepa rately or conjointly effective locking of both the saddle and the arm in insured. In Fig. 3

angles to its normal position for clearness in illustrating the action of the mechanism. In the arrangement shown in Figs. 4 to 6, a bracket j which is bolted to the underside of the saddle it on the radial arm 2' of the drilling machine, carries a pair of parallel rack bars a and 6. The bar a engages apinion f on a screwed stem 9 by which the saddle is clamped to the arm, while the bar Z) engages a toothed sector Z feather-keyed to shaft 70 which actuates the mechanism for locking the arm to the pillar of the machine. On a bracket 0 slidably carried on the rack bars is mounted a floating pinion (Z which engages both bars and is itself operated by a. hand lever 0.

Movement of the hand lever in one direction brings the locking mechanisms into action, while movement in the opposite direction puts them out of action. As both rack bars a and Z) and the bracket 0 are free to move, both bars can move together in opposite directions, or either bar can remain sta tionary while the other moves. Consequently a complete locking movement is imparted to the mechanism which secures the saddle to the arm, and that which secures the arm to the pillar.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In means for locking the saddle t0 the arm and the arm to the pillar of a radial arm drilling machine, the combination comprising a pair of relatively movable sliding members provided with rack teeth, an angnlarly movable toothed member in connection with the said sliding members, a hand lever secured to tne angularly movable member, and means operated by one otthe sliding members for locking the saddle to the arm and means operated by the other sliding ember for locking the arm to the pillar, substantially as described. 7

2. In means for locking the saddle to the arm and the arm to the pillar of a radial arm drilling machine, the combination com-' prising a pair of relatively movable rack bars, a bracket slidably carried on said bars,- a floating toothed member mounted on said bracket, a hand lever secured to said floating toothed member, and means operated by one of the sliding members for locking the saddle to the arm and means operated by the other sliding member for locking the arm to the pillar, substantially as described.

3. In means for locking the saddle to the arm and the arm to the pillar of a radial arm drilling machine, the combination comprising a pair of relatively movable rack bars, a bracket slidably carried on said bars, a floating pinion mounted on said bracket in engagement with each bar, a hand lever secured to the pinion, and a pair of toothed members respectively engaged by the rack bars one ofthe toothed members operating the means for locking the saddle to the arm and the other the means for locking the arm to the pillar, substantially as described.

In means for locking the saddle to the arm and the arm to the pillar of aradial arm drilling machine, the combination comprising a saddle, a bracket secured to the saddle, a cross shaft, a pair of parallel rack bars on the bracket, a bracket slidable on the rack bars, a floating pinion carried on the slidable bracket in engagement with both rack bars, a hand lever secured to the floating pinion, a screw locking stem, a pinion on said stem en aged by one of the rack bars, and a sector on the cross shaft engaged by the other rack bar, substantially as described.

In testimony whereof I have signed my name to this specification.

JOSEPH J EWSBURY. 

